申命記 9:5 註釋：Rashi, Ramban, Rashbam & Or HaChaim

לא בצדקתך אתה בא לרשת … כי ברשעת הגוים NOT FOR THY RIGHTEOUSNESS … DOST THOU GO TO POSSESS [THEIR LAND], but (כי) for the wickedness of these nations. — Here you have the word כי used in the sense of "but".

AND THAT HE MAY ESTABLISH THE WORD WHICH THE ETERNAL SWORE UNTO THY FATHERS. The purport thereof¹²⁴Since the merits of that generation were not sufficient to bring them victory, the question arises, “Why could not the entry into the Land be delayed for a worthier generation?” Ramban suggests that the verse before us gives an answer to this question. is that He had said and they shall serve them; and they shall afflict them four hundred years.¹²⁵Genesis 15:13. And in the fourth generation they shall come back hither.¹²⁶Ibid., Verse 16. Therefore it could not be postponed to a later generation.

לא בצדקתך וביושר לבבך, definitely not on account of your righteousness and your upright hearts. For I want you to remember 'זכור אל תשכח את אשר הקצפת וגו, and not forget how you have angered G’d, etc. However, one of the two factors you cited is correct, namely the wickedness of these nations. The reason that you replaced them (and not someone else) is למען הקים לך את השבועה, in order to fulfill by means of you the oath G’d swore to your forefathers.